Improvement in strength and thermal conductivity of powder metallurgy produced Cu–Ni–Si–Cr alloy by adjusting Ni/Si weight ratio and hot forging

Wang, Huei‐Sen; Chen, Hou-Guang; Gu, J. P.; Hsu, Chin-Ming; Wu, Chao‐Yi

doi:10.1016/j.jallcom.2015.02.024

Cited by 32 publications

(10 citation statements)

References 21 publications

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“…These results are consistent with the basic principles of copper alloy design based on metallurgy. 37,38 On the other side, when the content of strengthening elements such as Ni, Si, and Cr increases significantly, the EC of copper alloys will inevitably be adversely affected. To solve this contradiction, the scheme recommended by MLDS is to increase the concentration of P element, as the trace P element can purify the matrix and promote the precipitation of the second phase of Cu-Ni-Si alloys, which is beneficial to improving the EC of Cu-Ni-Si alloys.…”

Section: Construction and Application Of A Property-oriented Mldsmentioning

confidence: 99%

A property-oriented design strategy for high performance copper alloys via machine learning

et al. 2019

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Traditional strategies for designing new materials with targeted property including methods such as trial and error, and experiences of domain experts, are time and cost consuming. In the present study, we propose a machine learning design system involving three features of machine learning modeling, compositional design and property prediction, which can accelerate the discovery of new materials. We demonstrate better efficiency of on a rapid compositional design of high-performance copper alloys with a targeted ultimate tensile strength of 600-950 MPa and an electrical conductivity of 50.0% international annealed copper standard. There exists a good consistency between the predicted and measured values for three alloys from literatures and two newly made alloys with designed compositions. Our results provide a new recipe to realize the property-oriented compositional design for highperformance complex alloys via machine learning.

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Section: Construction and Application Of A Property-oriented Mldsmentioning

confidence: 99%

A property-oriented design strategy for high performance copper alloys via machine learning

et al. 2019

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“…Comparison of tensile strength and electrical conductivity of high-strength copper alloys. ( a ) Cu-Ni-Si systems alloys and other copper alloys [34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51] and ( b ) the designed alloy and other Cu-Ni-Si-X alloys [1,2,3,4,52,53,54,55,56,57,58,59]. …”

Section: Figurementioning

confidence: 99%

Effect of Ni/Si Mass Ratio and Thermomechanical Treatment on the Microstructure and Properties of Cu-Ni-Si Alloys

Li¹,

Huang²,

Mi³

et al. 2019

Materials

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The effect of the Ni/Si mass ratio and combined thermomechanical treatment on the microstructure and properties of ternary Cu-Ni-Si alloys is discussed systematically. The Cu-Ni-Si alloy with a Ni/Si mass ratio of 4–5 showed good comprehensive properties. Precipitates with disc-like shapes were confirmed as the Ni2Si phase with orthorhombic structure through transmission electron microscopy, high-resolution transmission electron microscopy, and 3D atom probe characterization. After the appropriate thermomechanical treatment, the studied alloy with a Ni/Si mass ratio of 4.2 exhibited excellent mechanical properties: a hardness of 290 HV, tensile strength of 855 MPa, yield strength of 782 MPa, and elongation of 4.5%. Compared with other approaches, the thermomechanical treatment increased the hardness and strength without sacrificing electrical conductivity. Theoretical calculations indicated that the high strength was primarily attributed to the Orowan precipitation strengthening and secondarily ascribed to the work hardening, which were highly consistent with the experimental results. The appropriate Ni/Si mass ratio with a low content of Ni and Si atoms shows high strength and excellent electrical conductivity through combined thermomechanical treatment. This work provides a guideline for the design and preparation of multicomponent Cu-Ni-Si-X alloys with ultrahigh strength and excellent electrical conductivity.

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“…Cu-Ni-Si alloys are widely used in electrical applications because of their high strength, excellent electric conductivity, and good anti-stress relaxation properties [1]. For the last few decades, the microstructure of the alloy has been developed by adjusting the Ni/Si ratio and optimizing the heat treatment process to further enhance the properties of the alloy [2]. Up to now, the pure ternary Cu-Ni-Si alloys has exhibited a high strength of 600–800 MPa and an electrical conductivity of 30%–45% IACS [3], but these values seem to reach the limits of ternary alloys.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Ni/Co Mass Ratio on the Microstructure and Properties of Quaternary Cu-Ni-Co-Si Alloys

Jiang

Huang²,

Mi³

et al. 2019

Materials

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The properties and microstructural evolution of quaternary Cu-Ni-Co-Si alloys with different Ni/Co mass ratios are investigated systematically. These alloys exhibit higher mechanical properties when the Ni/Co mass ratio is 1.12-1.95 (NC-4-NC-5) and show excellent electrical conductivity when the Ni/Co mass ratio is 0.05-0.5 (NC-1-NC-3). With an increase in the Ni/Co ratio, the dimension of precipitated phase continues to increase and the grain size also visibly grows and coarsens. At the same time, the precipitation process of the NC-5 alloy is the most adequate, resulting in the highest mechanical properties. In addition, the precipitated phase in the alloys was confirmed to be the (Ni, Co)2Si composite phase. The number of Ni2Si phases in the precipitated phase gradually increased, and the Ni atoms exhibited the strongest co-segregation alongside the increasing Ni/Co ratio. Compared with the alloy without a Co element, the addition of Co helped refine the grain size and accelerate the precipitation of the particle phase and purify solute atoms in the matrix, thereby simultaneously improving mechanical properties and conductivity. The present work provides a new method for the development of multicomponent Cu-Ni-Si-Co-X alloys with outstanding comprehensive performance.

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Improvement in strength and thermal conductivity of powder metallurgy produced Cu–Ni–Si–Cr alloy by adjusting Ni/Si weight ratio and hot forging

Cited by 32 publications

References 21 publications

A property-oriented design strategy for high performance copper alloys via machine learning

A property-oriented design strategy for high performance copper alloys via machine learning

Effect of Ni/Si Mass Ratio and Thermomechanical Treatment on the Microstructure and Properties of Cu-Ni-Si Alloys

Influence of the Ni/Co Mass Ratio on the Microstructure and Properties of Quaternary Cu-Ni-Co-Si Alloys

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